Decks have no permit

[Anthony Buoncora]

Hey everyone!  I am about to purchase my first home that I will be living in as my first home was an investment.  However, the home I am going to purchase has 2 large decks in the back of the house and neither of them have permits!  They are pretty big decks and look like they are in good shape but the footings all need to be redone and the structure in compromised in a few areas so I could never get a permit now without some serious repair.  

For example, the deck is attached OVER THE SIDING, as I mentioned all footings need to be redone.  

Is this going to cause a problem for me?  

Is there any chance that after I buy the home, the town makes me take both decks down?  

Thanks everyone in advance!  I use this site so frequently when looking for info and it is great for new investors.